S
M
T
W
T
F
S
27
63°
47°
28
65°
49°
29
64°
48°
30
63°
46°
1
63°
44°
2
68°
35°
3
71°
41°
4
77°
58°
5
79°
61°
6
62°
57°
7
61°
49°
8
62°
44°
9
61°
45°
10
68°
40°
11
71°
43°
12
70°
43°
13
72°
50°
14
66°
47°
15
63°
50°
16
60°
47°
17
53°
44°
18
56°
39°
19
59°
40°
20
62°
35°
21
64°
33°
22
61°
36°
23
64°
38°
24
65°
44°
25
64°
44°
26
59°
44°
27
60°
44°
28
58°
50°
29
64°
43°
30
59°
47°
31
59°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Portland
Portland's May 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Portland. See also: June | July | August.
